{"kind":"host","input":"umich.edu","report":{"host":"umich.edu","checkedAt":"2026-10-31T07:04:32.964Z","a":{"status":"found","values":["172.66.0.37","162.159.140.37"],"ttl":725,"via":"Cloudflare","cname":[]},"aaaa":{"status":"found","values":["2606:4700:7::25","2a06:98c1:58::25"],"ttl":928,"via":"Cloudflare","cname":[]},"verdict":"dual-stack","www":{"host":"www.umich.edu","a":{"status":"found","values":["172.66.0.37","162.159.140.37"],"ttl":255,"via":"Cloudflare","cname":[]},"aaaa":{"status":"found","values":["2606:4700:7::25","2a06:98c1:58::25"],"ttl":1800,"via":"Cloudflare","cname":[]},"verdict":"dual-stack"}},"readiness":{"grade":"B","summary":"Works over IPv6, with one gap: its mail servers lack IPv6.","reachabilityTested":true,"checks":[{"key":"web","label":"Website over IPv6","status":"pass","detail":"umich.edu has 2 IPv6 addresses and answers on every one we tested.","addresses":[{"address":"2606:4700:7::25","result":"answers","port":443},{"address":"2a06:98c1:58::25","result":"answers","port":443}]},{"key":"www","label":"www over IPv6","status":"pass","detail":"www.umich.edu has 2 IPv6 addresses and answers on every one we tested.","addresses":[{"address":"2606:4700:7::25","result":"answers","port":443},{"address":"2a06:98c1:58::25","result":"answers","port":443}]},{"key":"mail","label":"Mail servers (MX) have IPv6","status":"fail","detail":"None of the mail servers has an AAAA record.","hosts":[{"host":"mx1.a.mail.umich.edu","ipv6":false},{"host":"mx2.a.mail.umich.edu","ipv6":false}]},{"key":"dns","label":"Nameservers have IPv6","status":"pass","detail":"2 of 4 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.","hosts":[{"host":"dns1.itd.umich.edu","ipv6":true},{"host":"dns2.itd.umich.edu","ipv6":true},{"host":"dns3.umich.org","ipv6":false},{"host":"dns4.umich.org","ipv6":false}]}]},"https":{"status":"pass","summary":"Loads over IPv6 with a valid certificate: HTTP 403.","hops":[{"url":"https://umich.edu/","address":"2606:4700:7::25","status":403,"tls":"valid"}]},"receiptId":"fO8YPxqmX0","reused":true,"measuredAt":"2026-10-31T07:04:33.276Z"}